JP2016141593A - 高電気抵抗高ジルコニア電気溶融鋳造耐火物 - Google Patents
高電気抵抗高ジルコニア電気溶融鋳造耐火物 Download PDFInfo
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Abstract
【解決手段】ZrO2が85〜95重量%、Al2O3が0.1〜0.8重量%未満、SiO2が3.5〜10.0重量%、Na2OとK2Oの合計が0.05重量%未満、B2O3が0.1〜1.5重量%、MgOが0.1重量%以下、CaOが0.01〜0.2重量%、BaOとSrOに関しては、BaOが0.05〜3.0重量%、又は、SrOが0.01〜3.0重量%、双方含む時は、SrOが0.01重量%以上でSrOとBaOの合計が0.01〜3.0重量%、SnO2が0.1〜0.7重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、高温での高電気特性を有する高ジルコニア電気溶融鋳造耐火物。
【選択図】図1
Description
さらに、上記の耐火物単体に対する加熱や熱サイクルでは、ジルコン結晶を生成しにくい高ジルコニア電気溶融鋳造耐火物であっても、溶融ガラスと接触するとジルコン結晶が生成しやすくなる場合がある。特に、高ジルコニア電気溶融鋳造耐火物が液晶パネルガラス(LCD)(液晶ガラスと記載する場合もある)等の無アルカリガラスの溶解窯に使用されると、ジルコン結晶が生成しやすくなる場合が多い。
さらに、液晶パネルガラス(LCD)等の無アルカリガラスでは、その特性を向上させる為に従来よりも電気抵抗の高い組成のガラスを採用している。
高ジルコニア電気溶融鋳造耐火物のガラス相は、前述の通りAl2O3、SiO2、Na2O、B2O3、P2O5等の酸化物から構成されている。
同様に、降温時には、1400℃から600℃迄100℃毎に1分間保持しX線回折を行った。ジルコン結晶生成状態を評価する為に、ジルコン結晶の最強ピークの積分値をピーク面積として算出し、その数値をジルコン生成量の評価値とした。
12時間保持後の電気抵抗が安定している値であることを確認し、12時間保持後の電気抵抗を1650℃の電気抵抗として測定し、さらに、降温速度4℃/分で降温し、降温時1500℃での電気抵抗を測定した。
Claims (13)
- 化学成分としてZrO2が85〜95重量%であり、Al2O3が0.1〜0.8重量%未満、SiO2が3.5〜10.0重量%、Na2OとK2Oの合計が0.05重量%未満、B2O3が0.1〜1.5重量%、MgOが0.1重量%以下、CaOが0.01〜0.2重量%、BaOとSrOに関しては、単独で含有する場合は、BaOが0.05〜3.0重量%、或いは、SrOが0.01〜3.0重量%、双方含有する場合は、SrOが0.01重量%以上でSrOとBaOの合計が0.01〜3.0重量%、SnO2が0.1〜0.7重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、高温での高電気抵抗特性を有し、且つ、耐火物単体、溶融ガラスと接触した条件での加熱でもジルコン結晶生成や成長を著しく抑制できる高ジルコニア電気溶融鋳造耐火物。
- 化学成分としてZrO2が85〜95重量%であり、Al2O3が0.1〜0.8重量%未満、SiO2が3.5〜10.0重量%、Na2OとK2Oの合計が0.05重量%未満、B2O3が0.1〜1.5重量%、MgOが0.1重量%以下、CaOが0.01〜0.2重量%、BaOとSrOに関しては、単独で含有する場合は、BaOが0.05〜1.5重量%、或いは、SrOが0.01〜1.5重量%、双方含有する場合は、SrOが0.01重量%以上でSrOとBaOの合計が0.01〜1.5重量%、SnO2が0.1〜0.7重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、高温での高電気抵抗特性を有し、且つ、耐火物単体、溶融ガラスと接触した条件での加熱でもジルコン結晶生成や成長を著しく抑制できる高ジルコニア電気溶融鋳造耐火物。
- 化学成分としてZrO2が85〜95重量%であり、Al2O3が0.1〜0.8重量%未満、SiO2が4.0〜9.5重量%、Na2OとK2Oの合計が0.04重量%未満、B2O3が0.2〜1.0重量%、MgOが0.1重量%以下、CaOが0.01〜0.15重量%、BaOとSrOに関しては、単独で含有する場合は、BaOが0.05〜1.0重量%、或いは、SrOが0.01〜1.0重量%、或いは双方含有する場合はSrOが0.01重量%以上でSrOとBaOの合計が0.01〜1.0重量%、SnO2が0.1〜0.5重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、高温での高電気抵抗特性を有し、且つ、耐火物単体、溶融ガラスと接触した条件での加熱でもジルコン結晶生成や成長を著しく抑制できる高ジルコニア電気溶融鋳造耐火物。
- 化学成分としてZrO2が85〜95重量%であり、Al2O3が0.1〜0.8重量%未満、SiO2が4.0〜9.5重量%、Na2OとK2Oの合計が0.04重量%未満、B2O3が0.2〜1.0重量%、MgOが0.1重量%以下、CaOが0.01〜0.15重量%、BaOとSrOに関しては、単独で含有する場合は、BaOが0.5重量%を越えて1.0重量%以下、或いは、SrOが0.2〜1.0重量%、或いは双方含有する場合はSrOが0.2重量%以上でSrOとBaOの合計が0.2〜1.0重量%、SnO2が0.1〜0.5重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、高温での高電気抵抗特性を有し、且つ、耐火物単体、溶融ガラスと接触した条件での加熱でもジルコン結晶生成や成長を著しく抑制できる高ジルコニア電気溶融鋳造耐火物。
- 600℃1時間保持後1450℃まで昇温し1450℃1時間保持を1サイクルとして、20回繰り返し加熱後の残存体積膨張率が、10%以下である事を特徴とする請求項1〜4のいずれか1項に記載の高ジルコニア電気溶融鋳造耐火物。
- 高ジルコニア電気溶融鋳造耐火物製の坩堝に液晶ガラスを充填し、800℃3時間保持後1450℃まで昇温し、1450℃3時間保持を1サイクルとして、10回繰り返し加熱した後の残存体積膨張率が15%以下である事を特徴とする請求項1〜5のいずれか1項に記載の高ジルコニア電気溶融鋳造耐火物。
- 高ジルコニア電気溶融鋳造耐火物製の坩堝に液晶ガラスを充填し、800℃3時間保持後1450℃まで昇温し、1450℃3時間保持を1サイクルとして、10回繰り返し加熱した後の残存体積膨張率が10%以下である事を特徴とする請求項1〜5のいずれか1項に記載の高ジルコニア電気溶融鋳造耐火物。
- 1500℃の電気抵抗が150Ω・cm以上である請求項1〜7のいずれか1項に記載の高ジルコニア電気鋳造耐火物。
- 1500℃の電気抵抗が200Ω・cm以上である請求項1〜7のいずれか1項に記載の高ジルコニア電気鋳造耐火物。
- 1650℃で12時間加熱後の電気抵抗が90Ω・cm以上である請求項1〜9のいずれか1項に記載の高ジルコニア電気鋳造耐火物。
- 1650℃で12時間加熱後の電気抵抗が150Ω・cm以上である請求項1〜9のいずれか1項に記載の高ジルコニア電気鋳造耐火物。
- ZrO2が85〜95重量%であり、 Al2O3が0.1〜1.0重量%未満、SiO2が3.5〜10.0重量%、Na2OとK2Oの合計が0.05重量%未満、B2O3が0.1〜1.5重量%、MgOが0.1重量%以下、CaOが0.01〜0.2重量%、BaOとSrOに関しては、単独で含有する場合は、BaOが0.05〜3.0重量%、或いは、SrOが0.01〜3.0重量%、双方含有する場合は、SrOが0.01重量%以上でSrOとBaOの合計量が、0.01〜3.0重量%、SnO2が0.01〜0.7重量%、Fe2O3とTiO2の合計が0.3重量%以下、P2O5が0.01重量%未満、CuOが0.01重量%未満であり、1500℃での電気抵抗が150Ω・cm以上であり、且つ、耐火物単体の加熱後の残存体積膨張率が10%以下、溶融ガラスと接触した条件での加熱後の残存体積膨張率が15%以下でありジルコン結晶生成や成長を著しく抑制できる高ジルコニア電気溶融鋳造耐火物。
- ガラス溶融窯用である請求項1〜12のいずれか1項に記載の高ジルコニア電気溶融鋳造耐火物。
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